Qily Sensor Technology (Dongguan) Co., Ltd.

China's leading industrial safety / inspection / measurement light curtain manufacturer

Measuring light curtain detection is still widely used in tires, there are tire size measurement light curtains, tire sorting, etc. What are the tire inspection light curtain technologies? The analysis of automobile tire inspection light curtain technology is as follows:

1-Keli Safety Inspection Light Curtain Designed the infrared measurement light curtain software and hardware system according to the requirements for size inspection in the automobile tire production line. - The system hardware includes oppositely placed infrared emission line arrays, receiving line arrays, and single-chip microcomputer control systems, respectively performing infrared transmission and carrier, receiving and filtering and scanning, logic control, and data communication with the host computer. Data processing is performed by the host computer, related size detection of the measurement object is completed, and real-time imaging of the contour is performed. After system debugging and optimization, Keli SZM measuring light curtain resolution of 1mm, detection width of 2032mm scanning speed of up to 10 lines per second, fully meet the application requirements, this light curtain is also called tire size measurement light curtain .

2-Infrared scanning logic uses a 38 kHz frequency carrier to eliminate interference from visible light. At the same time, the double-cross synchronous scanning method is adopted to improve the resolution of the detection light curtain. Due to the infrared scattering and diffraction, the measurement error of the detection light curtain is increased, and the imaging edge is not uniform. For this purpose, the light shielding baffle is designed to focus the infrared rays, effectively reducing the emission angle of the infrared emission tube and the incidence of the receiving tube. The angle improves the measurement accuracy of the detection light curtain.

3. As the sensor detection light curtain, the measurement work is completed together with the host computer through the serial interface, and the communication protocol is designed for this purpose. The communication protocol also adopts the HEX.ASCII code data format, and the data of each frame is identified by an identification code, a data code, a check code, and a baud rate of 9600--19200 bits. -- The communication software of MCU is written by assembly language. Based on Visual Basic language, the communication, measurement and object contour imaging software of PC are developed. The debugging interface and the communication interface and software of the MCU control system and the host computer of the measurement light curtain can meet the parameters. Features such as setup, data processing and real-time imaging.

4. The safety light curtain MCU control system takes AT89C52 as the core, respectively expands RS-485 and RS-232 interface for serial communication with PC, and uses AT89C52 timer to design scan and control timing, complete carrier and shift. At the same time, the positioning signal, the data exchange with the PC, the infrared emission and the receiving circuit, the scanning method using the shift register in series, minimizes the connection between the MCU control board and the infrared transmitting board and the receiving board. The number of lines, the system stability and anti-interference ability are improved by reducing the long-line effect, and the PCB design of the infrared emission-receiving line array is a cascade structure, that is, the same 1 to 8 lengths of 254 mm PCB are connected in series, according to user parameters. Software selection to accommodate measurement requirements in the 254mm--2032mm range.